209 research outputs found
Various Types of Structural Ordering in a Cd-Yb Crystalline Approximant Under High Pressure and Low Temperature
No full textPressure–Volume Relationship of a Au–Al–Yb Intermediate Valence Quasicrystal and Its Crystalline Approximant
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SPring-8, What can we do now? Ultrahigh-Pressure Research with 8 GeV-SR X-ray at BL10XU.
No full textPressure–Volume Relationship of a Au–Al–Yb Intermediate Valence Quasicrystal and Its Crystalline Approximant
No full text正二十面体のAu-Al-Yb準結晶とその1/1近似結晶において室温でおよそ20GPaまでの準静水圧下における放射光X線回折測定を実施した。得られたそれぞれの圧縮曲線は類似しており、圧力に対して単調に減少する。これは高圧力下でこれらが安定であることを示している。得られた体積弾性率は準結晶で105.1(8)GPa、近似結晶で108.1(7)GPaであり、これらの値は基本的に各構成元素の体積弾性率の組成加重平均によって説明される。journal articl
Pressure-Induced Structural Transition and Long-Period Structures of Rare-Earth Metal Hydrides
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Individual differences in nest defense in the colonial breeding Black-tailed Gulls
No full textOften in colonial seabirds, all colony members are believed to defend against nest predators and experience equal nest predation risk. However, the variation of defense behavior among members and its reproductive consequences are largely unknown. We investigated 1) individual variation in the nest defense of breeding Black-tailed Gulls Larus crassirostris against a natural egg predator, the Jungle Crow Corvus macrorhynchos and 2) how this behavioral variation affects an individual's own nest predation risk and that of their neighbors. Results were compared between two years where crow attack levels were manipulated to average 5 and 22 times normal rates ("low" and "high" predation risk years, respectively) by the placement of varying numbers of artificial nests containing unguarded eggs at the perimeter of the gull colony. In both years, 23-38% of parents, mostly males, showed "aggressive" defense behavior (strikes or chases) against crows and decoys. Other "non-aggressive" gulls showed no defense. In the year of low predation risk, intrusion rates by crows (landing within 0.5 m of an individual gull's nest) were similar for aggressive and non-aggressive gulls. In the year of high predation risk, however, the rates of intrusion for aggressive gulls (4%) and for non-aggressive gulls with an aggressive neighbor (37%) were significantly lower than for non-aggressive gulls without an aggressive neighbor (76%). These results indicate that aggressive individuals reduce nest predation risk for themselves and conspecific neighbors in a colonially breeding species
Nano-structural perspective for destabilization of Mg hydride using immiscible transition metal of Mn
No full textHydrogenation reaction of Fe-Mo alloy under high pressure and high temperature and recovery of bcc phase at ambient pressure
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